Ok now the problem is this.

I have compiled some old code with Visual Studio 2008 (the code was
originally writen in Visual Studio 6) and i have this error:

Error 1 error C2681: 'void *' : invalid expression type for
dynamic_cast c:\Works\BaCCTester\Dev\Addins\Utils
\CommonDataManipulators\Sources\CommonDataFree.cpp 121
CommonDataManipulators

and the problematic line of code is this:
....
FunctionResponse* pFunctionResponse =
ACE_dynamic_cast(FunctionResponse*, data);
....

So it is logicaly that dynamic_cast does not work for void-pointers
since when I converted the pointer to void I have given up all type
information. But what makes me think twice about the corectness of the
previous sentence is that this code compiles perfectly under Visual
Studio 6. I would like to know more about this issue so any ,
references, links and so are highly appriciated.

Thank You,
Nikola Tanev

ONE MORE THINK TO ADD:
RTTI is turned ON

On Feb 26, 10:33 am, "j123...@gmail.com" <j123...@gmail.com> wrote:
> Ok now the problem is this.
>
> I have compiled some old code with Visual Studio 2008 (the code was
> originally writen in Visual Studio 6) and i have this error:
>
> Error 1 error C2681: 'void *' : invalid expression type for
> dynamic_cast c:\Works\BaCCTester\Dev\Addins\Utils
> \CommonDataManipulators\Sources\CommonDataFree.cpp 121
> CommonDataManipulators
>
> and the problematic line of code is this:
> ...
> FunctionResponse* pFunctionResponse =
> ACE_dynamic_cast(FunctionResponse*, data);
> ...
>
> So it is logicaly that dynamic_cast does not work for void-pointers
> since when I converted the pointer to void I have given up all type
> information. But what makes me think twice about the corectness of the
> previous sentence is that this code compiles perfectly under Visual
> Studio 6. I would like to know more about this issue so any ,
> references, links and so are highly appriciated.
>
> Thank You,
> Nikola Tanev

On Feb 26, 10:33 am, "j123...@gmail.com" <j123...@gmail.com> wrote:
> Ok now the problem is this.

> I have compiled some old code with Visual Studio 2008 (the
> code was originally writen in Visual Studio 6) and i have this
> error:

> Error 1 error C2681: 'void *' : invalid expression type for
> dynamic_cast c:\Works\BaCCTester\Dev\Addins\Utils
> \CommonDataManipulators\Sources\CommonDataFree.cpp 121
> CommonDataManipulators

> and the problematic line of code is this:
> ...
> FunctionResponse* pFunctionResponse =
> ACE_dynamic_cast(FunctionResponse*, data);
> ...

> So it is logicaly that dynamic_cast does not work for
> void-pointers since when I converted the pointer to void I
> have given up all type information. But what makes me think
> twice about the corectness of the previous sentence is that
> this code compiles perfectly under Visual Studio 6. I would
> like to know more about this issue so any , references,
> links and so are highly appriciated.

The real question is what ACE_dynamic_cast is. I suspect that
it's a macro, and probably expands differently depending on the
compiler, but I really don't know.

--
James Kanze (GABI Software) email:james.kanze@gmail.com
Conseils en informatique orientée objet/
Beratung in objektorientierter Datenverarbeitung
9 place Sémard, 78210 St.-Cyr-l'École, France, +33 (0)1 30 23 00 34

On Feb 26, 11:37 am, James Kanze <james.ka...@gmail.com> wrote:
> On Feb 26, 10:33 am, "j123...@gmail.com" <j123...@gmail.com> wrote:
>
>
>
> > Ok now the problem is this.
> > I have compiled some old code with Visual Studio 2008 (the
> > code was originally writen in Visual Studio 6) and i have this
> > error:
> > Error 1 error C2681: 'void *' : invalid expression type for
> > dynamic_cast c:\Works\BaCCTester\Dev\Addins\Utils
> > \CommonDataManipulators\Sources\CommonDataFree.cpp 121
> > CommonDataManipulators
> > and the problematic line of code is this:
> > ...
> > FunctionResponse* pFunctionResponse =
> > ACE_dynamic_cast(FunctionResponse*, data);
> > ...
> > So it is logicaly that dynamic_cast does not work for
> > void-pointers since when I converted the pointer to void I
> > have given up all type information. But what makes me think
> > twice about the corectness of the previous sentence is that
> > this code compiles perfectly under Visual Studio 6. I would
> > like to know more about this issue so any , references,
> > links and so are highly appriciated.
>
> The real question is what ACE_dynamic_cast is. I suspect that
> it's a macro, and probably expands differently depending on the
> compiler, but I really don't know.
>
> --
> James Kanze (GABI Software) email:james.ka...@gmail.com
> Conseils en informatique orientée objet/
> Beratung in objektorientierter Datenverarbeitung
> 9 place Sémard, 78210 St.-Cyr-l'École, France, +33 (0)1 30 23 00 34

Yes it is a macro
# define ACE_dynamic_cast(TYPE, EXPR) dynamic_cast<TYPE> (EXPR)
actualy it is a standard dynamic_cast and it is from the ACE libraries

On Feb 26, 8:18am, "j123...@gmail.com" <j123...@gmail.com> wrote:
> On Feb 26, 11:37 am, James Kanze <james.ka...@gmail.com> wrote:
>
> > On Feb 26, 10:33 am, "j123...@gmail.com" <j123...@gmail.com> wrote:
>
> > > Ok now the problem is this.
> > > I have compiled some old code with Visual Studio 2008 (the
> > > code was originally writen in Visual Studio 6) and i have this
> > > error:
> > > Error 1 error C2681: 'void *' : invalid expression type for
> > > dynamic_cast c:\Works\BaCCTester\Dev\Addins\Utils
> > > \CommonDataManipulators\Sources\CommonDataFree.cpp 121
> > > CommonDataManipulators
> > > and the problematic line of code is this:
> > > ...
> > > FunctionResponse* pFunctionResponse =
> > > ACE_dynamic_cast(FunctionResponse*, data);
> > > ...
> > > So it is logicaly that dynamic_cast does not work for
> > > void-pointers since when I converted the pointer to void I
> > > have given up all type information. But what makes me think
> > > twice about the corectness of the previous sentence is that
> > > this code compiles perfectly under Visual Studio 6. I would
> > > like to know more about this issue so any , references,
> > > links and so are highly appriciated.
>
> > The real question is what ACE_dynamic_cast is. I suspect that
> > it's a macro, and probably expands differently depending on the
> > compiler, but I really don't know.
>
> Yes it is a macro
> # define ACE_dynamic_cast(TYPE, EXPR) dynamic_cast<TYPE> (EXPR)
> actualy it is a standard dynamic_cast and it is from the ACE libraries

<InigoMontoyaVoice>You keep using that word. I do not think
it means what you think it means.</voice>

In this news group, "standard" means part of the standard
C++ language, not part of a commercial library, no matter
how many people use it.

As to your original question:
- Did you read the files for VS?

Compiler Error C2681
> A casting operator tried to convert from an invalid type.
> For example, if you use the dynamic_cast operator to
> convert an expression to a pointer type, the source
> expression must be a pointer.

- Did you consider asking your question in a news group
dealing with VS?

As to what older versions of VS would do: Older versions
were feydasque but fun. Lots of whacky things they did,
for many reasons, most of which are a bit off topic here.
Socks

äá á?


On Feb 26, 5:43 pm, Puppet_Sock <puppet_s...@hotmail.com> wrote:
> On Feb 26, 8:18 am, "j123...@gmail.com" <j123...@gmail.com> wrote:
>
>
>
> > On Feb 26, 11:37 am, James Kanze <james.ka...@gmail.com> wrote:
>
> > > On Feb 26, 10:33 am, "j123...@gmail.com" <j123...@gmail.com> wrote:
>
> > > > Ok now the problem is this.
> > > > I have compiled some old code with Visual Studio 2008 (the
> > > > code was originally writen in Visual Studio 6) and i have this
> > > > error:
> > > > Error 1 error C2681: 'void *' : invalid expression type for
> > > > dynamic_cast c:\Works\BaCCTester\Dev\Addins\Utils
> > > > \CommonDataManipulators\Sources\CommonDataFree.cpp 121
> > > > CommonDataManipulators
> > > > and the problematic line of code is this:
> > > > ...
> > > > FunctionResponse* pFunctionResponse =
> > > > ACE_dynamic_cast(FunctionResponse*, data);
> > > > ...
> > > > So it is logicaly that dynamic_cast does not work for
> > > > void-pointers since when I converted the pointer to void I
> > > > have given up all type information. But what makes me think
> > > > twice about the corectness of the previous sentence is that
> > > > this code compiles perfectly under Visual Studio 6. I would
> > > > like to know more about this issue so any , references,
> > > > links and so are highly appriciated.
>
> > > The real question is what ACE_dynamic_cast is. I suspect that
> > > it's a macro, and probably expands differently depending on the
> > > compiler, but I really don't know.
>
> > Yes it is a macro
> > # define ACE_dynamic_cast(TYPE, EXPR) dynamic_cast<TYPE> (EXPR)
> > actualy it is a standard dynamic_cast and it is from the ACE libraries
>
> <InigoMontoyaVoice>You keep using that word. I do not think
> it means what you think it means.</voice>
>
> In this news group, "standard" means part of the standard
> C++ language, not part of a commercial library, no matter
> how many people use it.
>
> As to your original question:
> - Did you read the files for VS?
>
> Compiler Error C2681
>
> > A casting operator tried to convert from an invalid type.
> > For example, if you use the dynamic_cast operator to
> > convert an expression to a pointer type, the source
> > expression must be a pointer.
>
> - Did you consider asking your question in a news group
> dealing with VS?
>
> As to what older versions of VS would do: Older versions
> were feydasque but fun. Lots of whacky things they did,
> for many reasons, most of which are a bit off topic here.
> Socks

j1230xz@gmail.com wrote:
> On Feb 26, 11:37 am, James Kanze <james.ka...@gmail.com> wrote:
>> On Feb 26, 10:33 am, "j123...@gmail.com" <j123...@gmail.com> wrote:
>>
>>
>>
>>> Ok now the problem is this.
>>> I have compiled some old code with Visual Studio 2008 (the
>>> code was originally writen in Visual Studio 6) and i have this
>>> error:
>>> Error 1 error C2681: 'void *' : invalid expression type
>>> for dynamic_cast c:\Works\BaCCTester\Dev\Addins\Utils
>>> \CommonDataManipulators\Sources\CommonDataFree.cpp 121
>>> CommonDataManipulators
>>> and the problematic line of code is this:
>>> ...
>>> FunctionResponse* pFunctionResponse =
>>> ACE_dynamic_cast(FunctionResponse*, data);
>>> ...
>>> So it is logicaly that dynamic_cast does not work for
>>> void-pointers since when I converted the pointer to void I
>>> have given up all type information. But what makes me think
>>> twice about the corectness of the previous sentence is that
>>> this code compiles perfectly under Visual Studio 6. I would
>>> like to know more about this issue so any , references,
>>> links and so are highly appriciated.
>>
>> The real question is what ACE_dynamic_cast is. I suspect that
>> it's a macro, and probably expands differently depending on the
>> compiler, but I really don't know.
>>
>> --
>> James Kanze (GABI Software) email:james.ka...@gmail.com
>> Conseils en informatique orientée objet/
>> Beratung in objektorientierter Datenverarbeitung
>> 9 place Sémard, 78210 St.-Cyr-l'École, France, +33 (0)1 30 23 00 34
>
> Yes it is a macro
> # define ACE_dynamic_cast(TYPE, EXPR) dynamic_cast<TYPE> (EXPR)
> actualy it is a standard dynamic_cast and it is from the ACE
> libraries

And now, what is FunctionResponse and data. Could any of them be void?


Bo Persson

On 26 Feb., 17:43, Puppet_Sock <puppet_s...@hotmail.com> wrote:
> On Feb 26, 8:18am, "j123...@gmail.com" <j123...@gmail.com> wrote:
>
>
>
>
>
> > On Feb 26, 11:37 am, James Kanze <james.ka...@gmail.com> wrote:
>
> > > On Feb 26, 10:33 am, "j123...@gmail.com" <j123...@gmail.com> wrote:
>
> > > > Ok now the problem is this.
> > > > I have compiled some old code with Visual Studio 2008 (the
> > > > code was originally writen in Visual Studio 6) and i have this
> > > > error:
> > > > Error 1 error C2681: 'void *' : invalid expression type for
> > > > dynamic_cast c:\Works\BaCCTester\Dev\Addins\Utils
> > > > \CommonDataManipulators\Sources\CommonDataFree.cpp 121
> > > > CommonDataManipulators
> > > > and the problematic line of code is this:
> > > > ...
> > > > FunctionResponse* pFunctionResponse =
> > > > ACE_dynamic_cast(FunctionResponse*, data);
[snip]
> > > The real question is what ACE_dynamic_cast is. I suspect that
> > > it's a macro, and probably expands differently depending on the
> > > compiler, but I really don't know.
>
> > Yes it is a macro
> > # define ACE_dynamic_cast(TYPE, EXPR) dynamic_cast<TYPE> (EXPR)
> > actualy it is a standard dynamic_cast and it is from the ACE libraries
>
> <InigoMontoyaVoice>You keep using that word. I do not think
> it means what you think it means.</voice>
>
> In this news group, "standard" means part of the standard
> C++ language, not part of a commercial library, no matter
> how many people use it.

But we found out that it really was a dynamic_cast (the errormessage
itself did show that if you read carefull), and in that case the
question definitely is standard, no matter if this is hidden inside
some hideous macro.

>
> As to your original question:
> - Did you read the files for VS?
>
> Compiler Error C2681
>
> > A casting operator tried to convert from an invalid type.
> > For example, if you use the dynamic_cast operator to
> > convert an expression to a pointer type, the source
> > expression must be a pointer.
>
> - Did you consider asking your question in a news group
> dealing with VS?
>
This question would only be appropriate in case the answer here
indicated that VS has a nonstandard behaviour.

[snip]

/Peter